How many questions is the Heavy Duty Equipment Technician (421A) Red Seal exam?

135 multiple-choice questions across 9 Major Work Activities, with a 4-hour time limit and a 70% pass mark, set by the Red Seal Occupational Standard and identical in every province.

Which authority administers the Heavy Duty Equipment Technician (421A) Red Seal exam in Alberta?

In Alberta, exam application, trade qualifier assessment, and exam sitting scheduling are administered by Alberta Apprenticeship and Industry Training (AIT).

Red Seal Pass › Heavy Duty Equipment Technician (421A) › Alberta

Heavy Duty Equipment Technician (421A) Red Seal Exam in Alberta

Q: Do I need a Red Seal certificate to work as a Heavy Duty Equipment Technician (421A) in Alberta?

Yes. Alberta lists this trade as compulsory (Heavy Equipment Technician — Heavy Duty Equipment Mechanic (Off Road)), so to perform restricted activities a worker must be a registered apprentice under supervision, a certified journeyperson, or hold a recognized trade certificate.

Certifying authority: Alberta Apprenticeship and Industry Training (AIT). Last checked 2026-09-10.

Certification is required in Alberta

This trade is on Alberta’s compulsory list as Heavy Equipment Technician — Heavy Duty Equipment Mechanic (Off Road). Under Alberta Apprenticeship and Industry Training (Tradesecrets), to perform restricted activities a worker must be a registered apprentice under supervision, a certified journeyperson, or hold a recognized trade certificate.

Source: Alberta Apprenticeship and Industry Training (Tradesecrets) — Compulsory Certification Trades

Preparing for the Heavy Duty Equipment Technician (421A) exam in Alberta?

Start with 10 free interactive Heavy Duty Equipment Technician (421A) questions with worked explanations, or take a full 135-question timed mock exam weighted to the official RSOS breakdown.

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Whether it is required or not, the exam itself is the same paper everywhere in Canada. What your province decides is whether you must hold the certificate, how you apply, and where you sit it.

The exam: 135 questions, 9 Major Work Activities

The Red Seal Occupational Standard sets the split below. It does not change by province.

Major Work Activity	Weighting	Questions
MWA A: Performs common occupational skills	7%	10 Qs
MWA B: Services, diagnoses and repairs engines and supporting systems	15%	20 Qs
MWA C: Services, diagnoses and repairs steering, suspension, brake and undercarriage systems, and wheel assemblies	12%	16 Qs
MWA D: Services, diagnoses and repairs electrical and electronic systems	19%	25 Qs
MWA E: Services, diagnoses and repairs drivetrain systems	13%	17 Qs
MWA F: Services, diagnoses and repairs environmental control systems	7%	9 Qs
MWA G: Services, diagnoses and repairs hydraulic, hydrostatic and pneumatic systems	19%	25 Qs
MWA H: Services, diagnoses and repairs structural components, operator stations, attachments and accessories	7%	9 Qs
MWA I: Services, diagnoses and repairs hybrid and all-electric equipment	3%	4 Qs

Source: Red Seal Exam Breakdown — Heavy Duty Equipment Technician (421A), red-seal.ca

Time allowed and pass mark

4 hours, and a 70% pass mark (95/135). These are set provincially rather than by the Red Seal standard, and the four hours is the same whether your paper is 100 or 150 questions.

Confirmed against Skilled Trades Ontario’s Exam Preparation Guide and SkilledTradesBC. Check your own authority before exam day.

Quick 3-Question Heavy Duty Equipment Technician (421A) Readiness Check

Click any option (A–D) below to grade yourself immediately and view the worked explanation:

Sample Question 1 of 3

A field technician from a Lethbridge dealer arrives at a farm yard to repair a broken hydraulic hose on a loader. The machine is parked on a slope near an overhead power line, it is windy, and the owner's children are playing nearby. The dealer requires a field level hazard assessment before any work starts. What should the technician do first?

A) Walk the site, list the hazards and the controls on the hazard assessment, and fix them before starting the repair

B) Start the repair at once, since a hose change is a short job and the hazards can be dealt with as they come up

C) Phone the shop to ask whether the job can be done, and then begin the repair while waiting for them to call back

D) Complete the hazard assessment form at the end of the job, once it is clear which hazards were actually present

Correct answer: A

A field level hazard assessment is done before work begins: the slope, the power line, the wind and bystanders are identified and controlled, for example by moving the machine and keeping people clear. Filling it in afterwards defeats its purpose, starting at once leaves the hazards in place on the grounds that the job is short, and a phone call to the shop does not identify or control anything on site.

Sample Question 2 of 3

While checking lateral runout on a newly mounted spoke wheel rim with a dial indicator held against the machined rim flange, you zero the gauge at the first spoke and record a high reading of +1.6 mm and a low reading of -0.9 mm during one full wheel revolution. What is the total lateral runout?

A) 3.2 mm

B) 0.7 mm

C) 2.5 mm

D) 1.25 mm

Correct answer: C

Total indicator reading (total lateral runout) is the algebraic difference between the highest and lowest readings: +1.6 mm - (-0.9 mm) = 1.6 + 0.9 = 2.5 mm. 0.7 mm subtracts the sizes and ignores the signs, 1.25 mm halves the total, and 3.2 mm doubles the high reading.

Sample Question 3 of 3

The operator of a grader at a Thunder Bay municipal yard says air comes out of the floor vents only, whichever mode is chosen, so the windshield will not clear. Temperature control and blower speeds work normally. With the dash panel off, the mode actuator is heard running, but the door does not move. What is the most likely cause?

A) A blend door actuator stuck at full heat, which sends all air to the floor

B) A stripped mode actuator gear or a broken link between it and the door

C) A blower resistor that has failed on the speeds used for the defrost vents

D) A plugged cab air filter that lets the air reach only the floor ducts

Correct answer: B

The mode door decides which vents get air. If the actuator runs but the door stays put, the drive between them has failed: a stripped gear inside the actuator or a broken or loose link. The blend door controls temperature, not where the air goes, a resistor controls speed, and a plugged filter weakens all the vents equally.

Where you write it in Alberta

Northern Alberta Institute of Technology (NAIT) — Edmonton, AB
Main testing center for Northern Alberta
Southern Alberta Institute of Technology (SAIT) — Calgary, AB
Primary testing center for Southern Alberta
Red Deer Polytechnic (RDP) — Red Deer, AB
Central Alberta regional examination center
Lethbridge College — Lethbridge, AB
Southern Alberta regional trades testing hub
Keyano College — Fort McMurray, AB
Wood Buffalo region heavy equipment & industrial testing facility

Booking is handled by Alberta Apprenticeship and Industry Training (AIT); confirm current locations and dates with them.

Preparing for the Heavy Duty Equipment Technician (421A) exam

Our Heavy Duty Equipment Technician (421A) question bank is built to the official RSOS weighting above, with a worked explanation and code citation on every question.

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